senior medical correspondent elizabeth cohen joins us now. elizabeth, you hear what we're talking about. well, people are just injured. they must be okay. no, not at all, right? what is the severity. what is needed to make sure these people can leave the hospital. >> chris, the severity as you said. you can't stay enough about how bad these injuries were, and what heroes these first responders were. so in the hospital right now, about 144 people, 17 of them critically injured. amputations have been very, very common. more than 10 amputations. you can see that a lot of them are centered around mass general, beth israel, boston medical, tufts medical center, a part of boston university. and you i both spoke to two nurses on the scene at the time of all of this happened. and they told you, look, we've stabilized folks, got them to ambulances, but we know they have a long road ahead of them. let's take a listen to what nurses said last night. >> i treated both a double amputee, a young child and also a young woman in a cardiac arrest. i think the